Abstract: An electrode for a lithium secondary battery 100 includes a current collector 11 having a plurality of bumps 12 on a surface thereof and an active material layer 15 including an active material member 14 formed on each of the plurality of bumps 12. The plurality of bumps 12 are regularly arrayed at an interval from one another on the surface of the current collector 11; a growth direction S of the active material members 14 is tilted with respect to the normal direction D of the current collector 11; voids 16 are formed between adjoining active material members 14; a proportion which the voids 16 account for in the active material layer 14 along any arbitrary direction is 5% or more on a plane which is parallel to the surface of the current collector 11; and tensile strength of the current collector 11 per 1 ?m of height of the active material members 14 is no less than 0.3 N/mm and no more than 1 N/mm.

Abstract: A lithium ion secondary battery including: a positive electrode current collector; a positive electrode active material layer that is provided in contact with the positive electrode current collector; a separator layer that is provided on a side of the positive electrode active material layer on which the positive electrode current collector is not provided; a negative electrode active material layer that is provided on a side of the separator layer on which the positive electrode active material layer is not provided, that primarily contains silicon or tin, and that includes a opposing portion opposing the positive electrode active material layer and a non-opposing portion not opposing the positive electrode active material layer, the opposing portion and the non-opposing portion containing lithium produced by a thin film-forming method; and a negative electrode current collector that is provided on a side of the negative electrode active material layer on which the separator layer is not provided.

Abstract: Disclosed is a method for producing a negative electrode for nonaqueous electrolyte batteries, which comprises the following three steps: (A) a step for forming a negative electrode by depositing a negative electrode active material on a collector; (B) a step for subjecting the negative electrode to a heat treatment; and (C) a step for providing the negative electrode active material with lithium after the step (B).

Abstract: This invention provides a negative electrode and a non-aqueous electrolyte secondary battery including the negative electrode. The negative electrode includes a Li-absorbing element as a negative electrode active material, is free from deformation, separation of the negative electrode active material layer from the negative electrode current collector, and deposition of lithium on the negative electrode current collector, and is excellent in cycle characteristic, large-current discharge characteristic, and low-temperature discharge characteristic. The negative electrode of this invention includes: a current collector having depressions and protrusions on a surface in the thickness direction thereof; and a negative electrode active material layer that includes a plurality of columns containing a negative electrode active material that absorbs and releases lithium ions, the columns being grown outwardly from the surface of the current collector.

Abstract: A positive electrode, a separator, and a negative electrode including an alloy-type negative electrode active material are stacked in this order, to form an electrode unit. Such electrode units are stacked with a separator interposed between each pair of the electrode units, to form a stacked electrode assembly. The stacked electrode assembly is fabricated, and the stacked electrode assembly is pressed during an initial charge and an initial discharge. As a result, a rate of increase of the thickness of the stacked electrode assembly due to a predetermined number of charge and discharge cycles becomes equal to or less than 10%. It is thus possible to obtain a lithium ion secondary battery having high capacity and high output, capable of maintaining battery performance such as charge/discharge cycle characteristics at a high level for a long time, and having long service life.

Abstract: A method for manufacturing a positive electrode plate for a non-aqueous secondary battery including: preparing an active material A, a conductive material B, a binder C, a thickener D, and a liquid component E, the thickener D being in a powder state, the conductive material B including a carbon material, the thickener D including a water-soluble polymer, and the liquid component E including water; preparing a slurry including the component E and an electrode material mixture, the material mixture including the active material A, the conductive material B, the binder C, and the thickener D; and applying the slurry on a current collector. In preparing the slurry, the thickener D in a powder state, the active material A and the conductive material B are kneaded together with the liquid component E, and then the primary kneaded matter, the binder C, and an additional liquid component are kneaded.

Abstract: In the negative electrode of the present invention, the negative electrode current collector includes a substrate and a plurality of protrusions, and the protrusions are formed on the surface of the substrate. The negative electrode active material layer includes a columnar active material layer and a stacked active material layer containing an alloy-based negative electrode active material. The columnar active material layer includes one or more columns that extend outwardly from the surface of the protrusions. The stacked active material layer is formed by stacking a thin film in a zigzag manner on the substrate surface between the protrusions. By using this negative electrode, negative electrode deformation, and separation of the negative electrode active material layer from the negative electrode current collector are suppressed, and a lithium ion secondary battery that has excellent charge and discharge cycle performance and output performance can be obtained.

Abstract: An electrode capable of effectively dispersing or relieving the stress generated in association with expansion and contraction of an active material is provided. The electrode is produced by forming an active material layer on a predetermined current collector. This current collector includes a base and a plurality of projections formed so as to extend outwardly from a surface of the base. The cross section of the projections in a thickness direction of the current collector has a tapered shape in which a width in a direction parallel to the surface of the base narrows from the surface of the base along an extending direction of the projections.

Abstract: A non-aqueous electrolyte secondary battery includes a negative electrode, a positive electrode, and a non-aqueous electrolyte interposed therebetween. On at least one side of a current collector of the negative electrode, is formed a negative-electrode mixture layer containing an active material capable of storing and emitting at least lithium ions. The negative-electrode mixture layer has a plurality of mixture-layer expansion-absorbing grooves formed parallel to each other in such a manner as to expose the current collector. The mixture-layer expansion-absorbing grooves are formed in the position facing the positive-electrode mixture layer.

Abstract: A negative electrode for non-aqueous electrolyte secondary batteries has a mixture layer disposed on a current collector. The mixture layer includes a composite negative electrode active material, a first binder containing an acryl-group-containing polymer, and a second binder containing adhesive rubber particles. The composite negative electrode active material contains carbon nanofibers, a catalyst element, and silicon-containing particles capable of charging and discharging at least lithium ions. The first binder binds the silicon-containing particles to the current collector, and the second binder binds the carbon nanofibers together.

Abstract: A negative electrode for nonaqueous electrolyte secondary battery comprising a current collector with a concave and a convex formed at least on one surface thereof, and a column member having n (n?2) stages of laminated columnar portions obliquely formed on the convex of the current collector, wherein a layer being less in expansion and contraction due to insertion and extraction of lithium ion is disposed in the column member.

Abstract: An active material of silicon, tin or a compound containing silicon or tin is formed on a current collector of a negative electrode in form of a plurality of island regions so that the island regions are separated from one another. Furthermore, a conductive protective film is formed on the current collector so as to cover the island regions. The conductive protective film is formed so as to also cover exposed regions (space portions) of the current collector on which the island regions are not formed. Thus, expansion/shrink of the active region following charge/discharge can be absorbed by the conductive protective film formed in the space portions between the island regions. Also, adhesiveness of the active material with the current collector can be improved.

Abstract: A non-aqueous electrolyte secondary battery of the present invention includes a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte. The negative electrode includes an active material and carbon nanofibers, and an end of the carbon nanofiber is attached to the active material. The non-aqueous electrolyte includes a non-aqueous solvent and a solute dissolved therein. The non-aqueous solvent includes a first solvent and a second solvent: the first solvent is a fluorine-containing compound and the second solvent is a solvent other than the fluorine-containing compound.

Abstract: A method for manufacturing a positive electrode plate for a non-aqueous secondary battery including: preparing an active material A, a conductive material B, a binder C, a thickener D, and a liquid component E, the thickener D being in a powder state, the conductive material B including a carbon material, the thickener D including a water-soluble polymer, and the liquid component E including water; preparing a slurry including the component E and an electrode material mixture, the material mixture including the active material A, the conductive material B, the binder C, and the thickener D; and applying the slurry on a current collector. In preparing the slurry, the thickener D in a powder state, the active material A and the conductive material B are kneaded together with the liquid component E, and then the primary kneaded matter, the binder C, and an additional liquid component are kneaded.